Compressor



Patented Dec. 25, 1928. i

Uru'rllo STATES .PATENT oFFic'E.

EUGENE L. BARNES, E WATEETOWN, NEW YORK, AssIGNoE To THE BARBER. As-

PHALT COMPANY, or PHILADELPHIA, PENNSYLVANIA, A coEPonATIoN or wEsT VIRGINIA.

' ooMPnEssoE.

Application loed lay 2v2,

.This invention relates to certainimprovements in compressorsand more particularly to a rotary compressorin which the structure includes means for sealing the compres--v sor against the escape of a fluid medium along the driving shaftof the compressor. ,Y

The compressoris particularly designed for use in connection with refrigerating apparatus in which a refrigerating mediumgaseous at certain pressures and temperatures-is utilized, and the main object of this invention is to provide a structure for preventing the escape of gas or `fluid along the compressor shaft, and particularly at the point where the shaft penetrates the compressionchamber.

Other objects and advantages relate to the details Wof the ,strcture for accomplishing the primary oliject of this'invention, all as 20 will more fully appear from the following description taken in connection with p the aclcompanying drawing, in which:

' Figure 1 1s a top plan view of a compressor embodying the -present improvements.

.25 Figure 2 is a section on line 22, Figure 1.

Figure Sois a section on line 3-3, Figure 1; and

lFigure 4 is an enlarged view of a portion of the means provided for sealing the struc- 30 tur against the escape of gas or liquid along f ,lirhegshaf As illustrated, the'npressor includes a .casing comprising the usual cylinder 1 andv end heads- 2, 3-. These portions of the structure are rigidly secured together in any suitable manner as by bolts --4..l equipped with nuts 5G- In the structure here illustrated, the head-72- is formed with an eccentrically arranged outwardly eX- 0 tending hollow boss 4 5-- into which lubri cant is adapted to be' admitted through pipe 6- from anysuitable source. n

The interior of the boss -5 is preferabl enlargedand shouldered near its inner i5 andy for the reception of a thin disk -7' of suitableA material, such as sheetmetal having' a small perforation 8- preferably ar-' ranged near its central portion. A ball bearing -9- for the inner end of the compressor 59 shaft -10- is likewise mounted, as here illustrated, inthe enlarge'd'portion within "the boss f5-' and may be in subst-antial contact with the disk -7-.-, and'has its innerjsurface flush with the inner wall of the 1925. 'serial Nn.' 32,174,

dial passageways in the shaft 10- to the rotor blades -12 and thereby to the inte- 65 rior of the cylinder '-1-. f

The rotor -11- at its outer end'is formed with an enlarged bore -13-` andthe shaft -1()-v is formed with a collar or 4circumferential flange lllfitted in said enlarged 70- bore of thev rotor. A thin'disk -15- of suitable material, such. as resilient metal, preferably bronze, etc. is secured in position between the cylinder ,-1- and thefront head -`-3-, and has an opening of a size 75 adapted to and arranged to receive the shaft -10-. Between the inner face of the annular disk -15 and the flange 14- upon shaft -10- is vinterposeda disk 16- of anti-frictional and non-scoring 'materi'ah 80 preferably liber, and a `similardisk 17- is mounted upon shaft 10- and held in' contact with the outersurface of the inner edgev of the annular disk -15-. y

Outside of the disk -17'- there is-mounted sa upon the shaft -1 O-- a collar -18- capable of limited movement lengthwise of said shaft, which is heldl in place by means of apin 19 lixed in and extending through the shaft 1Q and having its opposite ends pro- 9o jecting radially toseat in openings in the collar -18-,-. These openings are larger than the ends of the -pin -19-, whereby. limited movement ofthe collarlS is permitted. The collar,-,-18 is backed up by o5 l means of a coil spring #-20* surrounding .the shaft ,-10- and having its rear end `in contact with the collar -18-- and its front end in contact with ,the inner section of a ball-bearing ,-21- for the shaft -,-l0-, 10Ql said ball bearing having Yits outer section mounted in the cylindrical hub #-224 formed on the head f8". The driving pulley 2B- y is secured to the. shaft 10 in any suitable manner, as by a set screw -Qilfand it will be obvious thatthe spring -QOf may be properly tensioned between the collar 518-- and the hall-bearing -21- by pressing the ball-hearing inwardly or permitting it to move outwardly in accordance with the position ot' the hub ot' the pulley 23H and then rigidly securing said pulley in thedesired position by means ot the set screw -2-1-.

It will be obvious that the liber disk -1G is tightly conined and compressed between the flange llland the inner tace ot the disk .--15- and that the fiber disk -1T- is similarly compressed between the outer surface ot the inner portion otl the disk -15- and the inner end ot' the collar u. 1%-, and that under any condition of opf' ation, the spring 20- being properly tensioned by positioning the pulley -23, a` tight joint is positively maintained by axial compression which Willfprevent the escape. ot liquid or gaseous medium from the cylinder 1 ot the compressor along the driving shai't- 10 ol the rotor 11. Or, in other Words, -the tight. joint about the shatt -10- maintained by constant axial compression of the` disks 1G- and -17-,- directed against said shaft.

The inner cent-ral tace ot the disk lfis in prac-tical e'tect a ange rigidly secured to and extending inwardly from the head -3- and is as above,described, preferably of a somewhat flexible resilient nature so as to compensate for and treely permit satisfactory rotation of the compressor shaft, should the same be slightly loose in its hearings, or out of line, While at all times maintaining a sealed joint.

lt is possible to omit anti-trictional disk -16- it the shaft flange and the inner central tac-e ot disk F15- are formed ot' snitable met als with perhaps 'somewhat less advantageous results, and the disk 17- may at times be entirely omitted and a ring of any material substituted forv it. The pin 19 may be entirely omitted with the collar 18 freely slidable along the shaft 10, and this is particularly true when an arrangement is used in which said collar and the spring 20 do not rotate with the pulley 2).

Altho l have shown and described a speeil'ic structure as illustrative ot a perhaps preferred embodiment ot my invention, 'I do not desire to restrict myself to the details ot' the same, or to the particular torni and rela- .tion ot the parts thereof, as various changes and modifications may be made Within the scope of the appendedy claims.

I claim z- 1. In a rotarycompressor, the Combination with the compressor casing ot anapertn'red liexible diaphragm secured to the casing at its outer portion; a. rotaryv shalt in the asing extending through said diaphragm: and means turning' with lsaid shaft in' rubbing contact at each side ot said diaphragm, 'including' an abutment shoulder on the shat't at one side o't' the diaphragnn a collar on the shaft turning therewith at the other side of the diaphragm, and means yieldingly urging said collar toward said diapliragmI and shoulder. v

2. In a rotary con'ipressor, the combination with a compressor casing` having a. lateral hearing' housing an`d'a shouldered rotary shaftt in said easing' with a bearing' in said` housing, ot a. liexible diaphragm around the shatt between shoulder and bearing'. a Collar on the shaft between diaphragm and hearing. and spring means between said hearing' and collar urging the latter toward said diav phragm and shoulder.

ln Witness Whereo't' l have hereunto set inyhand this 12th dav o t Way, 1925.

EUGENE li. Biilhll, 

